5"/54 caliber Mark 45 gun

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Mark 45 5-inch/54-caliber lightweight gun
5"/54 Mark 45 mod 2 firing
Type Naval gun
Place of origin United States
Service history
In service Mark 45 Mod 0: 1971
Mark 45 Mod 1: 1980
Mark 45 Mod 2: 1988
Used by See users
Production history
Designed 1968
Manufacturer BAE Systems Land and Armaments
Weight 21.7 short tons (19.7 t)
shell: up to 70 lb (32 kg)
Length 29.5 ft (9 m)
Barrel length 22.5 ft (6.86 m)
19.1 ft (5.82 m) (rifling)
8,000 rounds (barrel life)

Caliber 5 inches (127 mm)
Elevation 65 / -15 degrees
rate: 20 degree/s
Traverse 170 degrees either side of centerline
rate: 30 degree/s
Rate of fire 16–20 rounds per minute automatic[1]
Muzzle velocity 2,650 ft/s (808 m/s) full service charge
1,500 ft/s (460 m/s) reduced charge for defilade fire or illumination rounds
Effective range 13 nautical miles (24 km)
Feed system 600 rounds (Ticonderoga class)
680 rounds (Arleigh Burke class)
475–500 rounds (Other classes)

The 5-Inch/54-caliber (Mk 45) lightweight gun is a modern U.S. naval artillery gun mount consisting of a 5-inch (127 mm) L54 Mark 19 gun on the Mark 45 mount. It is designed to be used against surface warships, for anti-aircraft use and shore bombardment to support amphibious operations.

The gun mount features an automatic loader with a capacity of 20 rounds. These can be fired under full automatic control, taking a little over a minute to exhaust those rounds at maximum fire rate. For sustained use, the gun mount would be occupied (below deck) by a three-man crew (gun captain, panel operator, and ammunition loader) to keep the gun supplied with ammunition.


Development started in the 1960s as a replacement for the 5-inch/54 Mark 42 gun system with a new, lighter, and easier to maintain gun mounting. In USN use, the Mark 45 is used with either the Mk 86 Gun Fire Control System or the Mk 160 Gun Computing System. Since before World War II, 5" has been the standard gun caliber for U.S. Naval ships. Its rate of fire is lower than the British 4.5-inch (114 mm) gun, but it fires a heavier 5" shell, and carries a larger burst charge which increases its per-shell effectiveness against aircraft.


  • Mod 0: used mechanical fuze setter. Two piece rifled construction, with replaceable liner
  • Mod 1: electronic fuze setter replaces the mechanical one. Made with a unitary construction barrel, which has a life span approximately twice that of the Mark 42 gun.
  • Mod 2: export version of Mod 1, but now used in the US Navy
  • Mod 3: same gun with a new control system; never put into production
  • Mod 4: longer barrel (62 calibers in length versus 54) for more complete propellant combustion, higher velocity and greater utility as a land attack weapon.

In sustained firing operations (Mode III), the gun is manned by a three-man crew all located below decks. These are a gun captain, a panel operator, and ammunition loader. In fully automatic non-sustained firing operations (Mode IV), the gun can be fired without any personnel inside the mount. However, sustained fire is limited to the capacity of the automatic loader (20 rounds).


 United States
United States Navy
Active service ships:
Royal Australian Navy
23x15px Denmark
Royal Danish Navy
23x15px Greece
Hellenic Navy
Japan Maritime Self-Defense Force
Republic of Korea Navy
23x15px New Zealand
Royal New Zealand Navy
Spanish Navy
Republic of China Navy
23x15px Thailand
Royal Thai Navy
23x15px Turkey
Turkish Navy

See also



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External links

  • 1.0 1.1 1.2 1.3 "The US Navy -- Fact File". 2008-01-15.